<!DOCTYPE html>
<html lang="zh-CN">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width,initial-scale=1">
    <title>java-网络编程 | 凌歆的博客</title>
    <meta name="generator" content="VuePress 1.9.5">
    <link rel="icon" href="/img/favicon.ico">
    <meta name="description" content="web前端技术博客,专注web前端学习与总结。JavaScript,js,ES6,TypeScript,vue,React,python,css3,html5,Node,git,github等技术文章。">
    <meta name="keywords" content="前端博客,个人技术博客,前端,前端开发,前端框架,web前端,前端面试题,技术文档,学习,面试,JavaScript,js,ES6,TypeScript,vue,python,css3,html5,Node,git,github,markdown">
    <meta name="baidu-site-verification" content="7F55weZDDc">
    <meta name="theme-color" content="#11a8cd">
    
    <link rel="preload" href="/assets/css/0.styles.d9c8cf8c.css" as="style"><link rel="preload" href="/assets/js/app.57550e13.js" as="script"><link rel="preload" href="/assets/js/2.f014c35f.js" as="script"><link rel="preload" href="/assets/js/88.81ef718d.js" as="script"><link rel="prefetch" href="/assets/js/10.03a98811.js"><link rel="prefetch" href="/assets/js/100.145e708e.js"><link rel="prefetch" href="/assets/js/101.098ca5c8.js"><link rel="prefetch" href="/assets/js/102.4d45c69a.js"><link rel="prefetch" href="/assets/js/103.499de505.js"><link rel="prefetch" href="/assets/js/104.c2c1b9b6.js"><link rel="prefetch" href="/assets/js/105.4e9b0663.js"><link rel="prefetch" href="/assets/js/106.9bb8cf6f.js"><link rel="prefetch" href="/assets/js/107.a81b32d7.js"><link rel="prefetch" href="/assets/js/108.81511e67.js"><link rel="prefetch" href="/assets/js/109.6a6741bf.js"><link rel="prefetch" href="/assets/js/11.e8729182.js"><link rel="prefetch" href="/assets/js/110.de657fe7.js"><link rel="prefetch" href="/assets/js/111.b092af6d.js"><link rel="prefetch" href="/assets/js/112.2dca5709.js"><link rel="prefetch" href="/assets/js/113.dbed1fac.js"><link rel="prefetch" href="/assets/js/114.e95a0131.js"><link rel="prefetch" href="/assets/js/115.2e3e8285.js"><link rel="prefetch" href="/assets/js/116.e64f7fec.js"><link rel="prefetch" href="/assets/js/117.583552c9.js"><link rel="prefetch" href="/assets/js/118.aa5d18f0.js"><link rel="prefetch" href="/assets/js/119.0c7b52d7.js"><link rel="prefetch" href="/assets/js/12.d63acec2.js"><link rel="prefetch" href="/assets/js/120.13f86281.js"><link rel="prefetch" href="/assets/js/121.e2b5b7f9.js"><link rel="prefetch" href="/assets/js/122.5252216a.js"><link rel="prefetch" href="/assets/js/123.8b8a3503.js"><link rel="prefetch" href="/assets/js/124.60df855c.js"><link rel="prefetch" href="/assets/js/125.f073ab1c.js"><link rel="prefetch" href="/assets/js/126.7b73de6a.js"><link rel="prefetch" href="/assets/js/127.4e25971c.js"><link rel="prefetch" href="/assets/js/128.0edf0e06.js"><link rel="prefetch" href="/assets/js/129.5cb5a70a.js"><link rel="prefetch" href="/assets/js/13.2259ef71.js"><link rel="prefetch" href="/assets/js/130.00247fda.js"><link rel="prefetch" href="/assets/js/131.d6fc003a.js"><link rel="prefetch" href="/assets/js/132.1a32b18f.js"><link rel="prefetch" href="/assets/js/133.e46c0193.js"><link rel="prefetch" href="/assets/js/134.a6ad681f.js"><link rel="prefetch" href="/assets/js/135.2fcbe137.js"><link rel="prefetch" href="/assets/js/136.f69bf451.js"><link rel="prefetch" href="/assets/js/137.b9ef2fcc.js"><link rel="prefetch" href="/assets/js/138.7fdd9feb.js"><link rel="prefetch" href="/assets/js/139.a3a37c91.js"><link rel="prefetch" href="/assets/js/14.0d6b23b9.js"><link rel="prefetch" href="/assets/js/140.a7c013ae.js"><link rel="prefetch" href="/assets/js/141.956c36ce.js"><link rel="prefetch" href="/assets/js/142.5aacfe42.js"><link rel="prefetch" href="/assets/js/143.57d691ef.js"><link rel="prefetch" href="/assets/js/144.b1e5766e.js"><link rel="prefetch" href="/assets/js/145.463284b7.js"><link rel="prefetch" href="/assets/js/146.6cc6420c.js"><link rel="prefetch" href="/assets/js/147.5b78c5a2.js"><link rel="prefetch" href="/assets/js/148.8d1d7679.js"><link rel="prefetch" href="/assets/js/149.4e0eb213.js"><link rel="prefetch" href="/assets/js/15.f6fde69d.js"><link rel="prefetch" href="/assets/js/150.b183de37.js"><link rel="prefetch" href="/assets/js/151.729ae770.js"><link rel="prefetch" href="/assets/js/152.b1297018.js"><link rel="prefetch" href="/assets/js/153.bb991bca.js"><link rel="prefetch" href="/assets/js/154.6f2286aa.js"><link rel="prefetch" href="/assets/js/155.6a9c7e4d.js"><link rel="prefetch" href="/assets/js/156.f7bd535d.js"><link rel="prefetch" href="/assets/js/157.64c0065c.js"><link rel="prefetch" href="/assets/js/158.d31ae949.js"><link rel="prefetch" href="/assets/js/159.7daea8a7.js"><link rel="prefetch" href="/assets/js/16.7be21beb.js"><link rel="prefetch" href="/assets/js/160.33cc971a.js"><link rel="prefetch" href="/assets/js/161.1676442a.js"><link rel="prefetch" href="/assets/js/162.71378046.js"><link rel="prefetch" href="/assets/js/163.99e49959.js"><link rel="prefetch" href="/assets/js/164.306f07d2.js"><link rel="prefetch" href="/assets/js/165.170977c7.js"><link rel="prefetch" href="/assets/js/166.f8602525.js"><link rel="prefetch" href="/assets/js/167.eea5c001.js"><link rel="prefetch" href="/assets/js/168.0146a311.js"><link rel="prefetch" href="/assets/js/169.05f9c9d9.js"><link rel="prefetch" href="/assets/js/17.2543f471.js"><link rel="prefetch" href="/assets/js/170.25d602b2.js"><link rel="prefetch" href="/assets/js/171.1ada26a6.js"><link rel="prefetch" href="/assets/js/172.2a0f697c.js"><link rel="prefetch" href="/assets/js/173.230d8ca8.js"><link rel="prefetch" href="/assets/js/174.e3758a2b.js"><link rel="prefetch" href="/assets/js/175.0f19f8ea.js"><link rel="prefetch" href="/assets/js/176.bf70d37d.js"><link rel="prefetch" href="/assets/js/177.4400f272.js"><link rel="prefetch" href="/assets/js/178.85af7b89.js"><link rel="prefetch" href="/assets/js/179.4cfaaaa2.js"><link rel="prefetch" href="/assets/js/18.394415f8.js"><link rel="prefetch" href="/assets/js/180.449c8409.js"><link rel="prefetch" href="/assets/js/181.73276924.js"><link rel="prefetch" href="/assets/js/182.5fab25cc.js"><link rel="prefetch" href="/assets/js/183.ecd4934d.js"><link rel="prefetch" href="/assets/js/184.246092cf.js"><link rel="prefetch" href="/assets/js/185.c671cd86.js"><link rel="prefetch" href="/assets/js/186.49bd1963.js"><link rel="prefetch" href="/assets/js/187.1fb32764.js"><link rel="prefetch" href="/assets/js/188.7c6885e9.js"><link rel="prefetch" href="/assets/js/189.a8701dec.js"><link rel="prefetch" href="/assets/js/19.ca7db8ea.js"><link rel="prefetch" href="/assets/js/190.ae3d3bde.js"><link rel="prefetch" href="/assets/js/191.ad7cd44e.js"><link rel="prefetch" href="/assets/js/192.bc443842.js"><link rel="prefetch" href="/assets/js/193.e4755764.js"><link rel="prefetch" href="/assets/js/194.814112ce.js"><link rel="prefetch" href="/assets/js/195.1c0aaa80.js"><link rel="prefetch" href="/assets/js/196.a6bd7add.js"><link rel="prefetch" href="/assets/js/20.4e91cd31.js"><link rel="prefetch" href="/assets/js/21.f095e6e1.js"><link rel="prefetch" href="/assets/js/22.72f4b8ab.js"><link rel="prefetch" href="/assets/js/23.e94eb9d2.js"><link rel="prefetch" href="/assets/js/24.0eae7d6f.js"><link rel="prefetch" href="/assets/js/25.36157609.js"><link rel="prefetch" href="/assets/js/26.dc5b6cba.js"><link rel="prefetch" href="/assets/js/27.c19b7b63.js"><link rel="prefetch" href="/assets/js/28.3aceae59.js"><link rel="prefetch" href="/assets/js/29.536091b3.js"><link rel="prefetch" href="/assets/js/3.d11119c4.js"><link rel="prefetch" href="/assets/js/30.821a4a30.js"><link rel="prefetch" href="/assets/js/31.5238784c.js"><link rel="prefetch" href="/assets/js/32.10bc7179.js"><link rel="prefetch" href="/assets/js/33.c1ed69c9.js"><link rel="prefetch" href="/assets/js/34.8d384231.js"><link rel="prefetch" href="/assets/js/35.d8890e52.js"><link rel="prefetch" href="/assets/js/36.eca37ad5.js"><link rel="prefetch" href="/assets/js/37.802549e3.js"><link rel="prefetch" href="/assets/js/38.53841770.js"><link rel="prefetch" href="/assets/js/39.7ae44409.js"><link rel="prefetch" href="/assets/js/4.493b9bca.js"><link rel="prefetch" href="/assets/js/40.ce56364a.js"><link rel="prefetch" href="/assets/js/41.85f0114b.js"><link rel="prefetch" href="/assets/js/42.714da6e2.js"><link rel="prefetch" href="/assets/js/43.fee4437c.js"><link rel="prefetch" href="/assets/js/44.b039b68b.js"><link rel="prefetch" href="/assets/js/45.96a55605.js"><link rel="prefetch" href="/assets/js/46.956ffb03.js"><link rel="prefetch" href="/assets/js/47.147d9218.js"><link rel="prefetch" href="/assets/js/48.ff787b40.js"><link rel="prefetch" href="/assets/js/49.871eee87.js"><link rel="prefetch" href="/assets/js/5.e0ba07d7.js"><link rel="prefetch" href="/assets/js/50.99b7c29e.js"><link rel="prefetch" href="/assets/js/51.8ecbf4ba.js"><link rel="prefetch" href="/assets/js/52.53d91d7e.js"><link rel="prefetch" href="/assets/js/53.af8a0d2a.js"><link rel="prefetch" href="/assets/js/54.a2f848b5.js"><link rel="prefetch" href="/assets/js/55.267e9947.js"><link rel="prefetch" href="/assets/js/56.0b201c40.js"><link rel="prefetch" href="/assets/js/57.cbdfd6f7.js"><link rel="prefetch" href="/assets/js/58.636c0c3f.js"><link rel="prefetch" href="/assets/js/59.fc9216c4.js"><link rel="prefetch" href="/assets/js/6.b98373f2.js"><link rel="prefetch" href="/assets/js/60.34f16fc4.js"><link rel="prefetch" href="/assets/js/61.4d130bd8.js"><link rel="prefetch" href="/assets/js/62.927caa10.js"><link rel="prefetch" href="/assets/js/63.a451fee0.js"><link rel="prefetch" href="/assets/js/64.32a5d47b.js"><link rel="prefetch" href="/assets/js/65.bc099429.js"><link rel="prefetch" href="/assets/js/66.3953050d.js"><link rel="prefetch" href="/assets/js/67.e934823b.js"><link rel="prefetch" href="/assets/js/68.4bcb52b0.js"><link rel="prefetch" href="/assets/js/69.bede18c8.js"><link rel="prefetch" href="/assets/js/7.8de8df2d.js"><link rel="prefetch" href="/assets/js/70.fce1daac.js"><link rel="prefetch" href="/assets/js/71.ea0a8c5d.js"><link rel="prefetch" href="/assets/js/72.15382c9e.js"><link rel="prefetch" href="/assets/js/73.848364d3.js"><link rel="prefetch" href="/assets/js/74.5fd08a50.js"><link rel="prefetch" href="/assets/js/75.c937c70d.js"><link rel="prefetch" href="/assets/js/76.a0dacd5a.js"><link rel="prefetch" href="/assets/js/77.4019cc23.js"><link rel="prefetch" href="/assets/js/78.9676a9e1.js"><link rel="prefetch" href="/assets/js/79.e46e10d5.js"><link rel="prefetch" href="/assets/js/8.2098eb96.js"><link rel="prefetch" href="/assets/js/80.987e83cb.js"><link rel="prefetch" href="/assets/js/81.eb98ff36.js"><link rel="prefetch" href="/assets/js/82.623561a7.js"><link rel="prefetch" href="/assets/js/83.e256d909.js"><link rel="prefetch" href="/assets/js/84.7d06a550.js"><link rel="prefetch" href="/assets/js/85.b8d9879e.js"><link rel="prefetch" href="/assets/js/86.31c4581b.js"><link rel="prefetch" href="/assets/js/87.e06ee05e.js"><link rel="prefetch" href="/assets/js/89.ba237d2f.js"><link rel="prefetch" href="/assets/js/9.36092fd0.js"><link rel="prefetch" href="/assets/js/90.ad2c9d92.js"><link rel="prefetch" href="/assets/js/91.a661f52d.js"><link rel="prefetch" href="/assets/js/92.1c28035b.js"><link rel="prefetch" href="/assets/js/93.c8b8e3d6.js"><link rel="prefetch" href="/assets/js/94.b6bc4a44.js"><link rel="prefetch" href="/assets/js/95.92cea882.js"><link rel="prefetch" href="/assets/js/96.5373491b.js"><link rel="prefetch" href="/assets/js/97.bb39efc8.js"><link rel="prefetch" href="/assets/js/98.af7a030f.js"><link rel="prefetch" href="/assets/js/99.07dc87d8.js">
    <link rel="stylesheet" href="/assets/css/0.styles.d9c8cf8c.css">
  </head>
  <body class="theme-mode-light">
    <div id="app" data-server-rendered="true"><div class="theme-container sidebar-open have-rightmenu"><header class="navbar blur"><div title="目录" class="sidebar-button"><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" role="img" viewBox="0 0 448 512" class="icon"><path fill="currentColor" d="M436 124H12c-6.627 0-12-5.373-12-12V80c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12z"></path></svg></div> <a href="/" class="home-link router-link-active"><img src="https://lingxin-tanhua.oss-cn-shanghai.aliyuncs.com/QQ%E6%88%AA%E5%9B%BE20220503092755.png" alt="凌歆的博客" class="logo"> <span class="site-name can-hide">凌歆的博客</span></a> <div class="links"><div class="search-box"><input aria-label="Search" autocomplete="off" spellcheck="false" value=""> <!----></div> <nav class="nav-links can-hide"><div class="nav-item"><a href="/" class="nav-link">首页</a></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="前端" class="dropdown-title"><a href="/web/" class="link-title">前端</a> <span class="title" style="display:none;">前端</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><h4>学习笔记</h4> <ul class="dropdown-subitem-wrapper"><li class="dropdown-subitem"><a href="/note/html/" class="nav-link">HTML笔记</a></li><li class="dropdown-subitem"><a href="/note/js-low/" class="nav-link">JavaScript基础笔记</a></li><li class="dropdown-subitem"><a href="/note/js-high/" class="nav-link">JavaScript高阶笔记</a></li><li class="dropdown-subitem"><a href="/note/js-dom-bom/" class="nav-link">JavaScript DOM和BOM笔记</a></li><li class="dropdown-subitem"><a href="/note/jquery/" class="nav-link">jQuery笔记</a></li><li class="dropdown-subitem"><a href="/note/ajax/" class="nav-link">Ajax笔记</a></li><li class="dropdown-subitem"><a href="/note/nodejs/" class="nav-link">NodeJs笔记</a></li><li class="dropdown-subitem"><a href="/note/reg/" class="nav-link">正则表达式笔记</a></li><li class="dropdown-subitem"><a href="/note/vue/" class="nav-link">Vue笔记</a></li><li class="dropdown-subitem"><a href="/note/react/" class="nav-link">react笔记</a></li><li class="dropdown-subitem"><a href="/note/wx/" class="nav-link">微信小程序笔记</a></li><li class="dropdown-subitem"><a href="/note/uniapp/" class="nav-link">uniapp笔记</a></li><li class="dropdown-subitem"><a href="/note/echarts/" class="nav-link">echarts笔记</a></li><li class="dropdown-subitem"><a href="/note/git/" class="nav-link">Git笔记</a></li></ul></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="后端" class="dropdown-title"><a href="/back/" class="link-title">后端</a> <span class="title" style="display:none;">后端</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/note/java/" class="nav-link">JAVA</a></li><li class="dropdown-item"><!----> <a href="/note/javaweb/" class="nav-link">JavaWeb</a></li><li class="dropdown-item"><!----> <a href="/note/mysql/" class="nav-link">MySql</a></li><li class="dropdown-item"><!----> <a href="/note/ssm/" class="nav-link">ssm</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="算法" class="dropdown-title"><a href="/algor/" class="link-title">算法</a> <span class="title" style="display:none;">算法</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/note/sf/" class="nav-link">算法训练营</a></li><li class="dropdown-item"><!----> <a href="/note/js-sf/" class="nav-link">js数据结构与算法</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="面试" class="dropdown-title"><a href="/mianshi/" class="link-title">面试</a> <span class="title" style="display:none;">面试</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/note/lqb/" class="nav-link">蓝桥杯备战</a></li><li class="dropdown-item"><!----> <a href="/note/ms/" class="nav-link">前端面试</a></li><li class="dropdown-item"><!----> <a href="/note/hmms/" class="nav-link">黑马面试</a></li><li class="dropdown-item"><!----> <a href="/note/xzms/" class="nav-link">校招零距离面试</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="解决方案" class="dropdown-title"><a href="/resolve/" class="link-title">解决方案</a> <span class="title" style="display:none;">解决方案</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/note/qd-resolve/" class="nav-link">前端解决方案</a></li><li class="dropdown-item"><!----> <a href="/note/hd-resolve/" class="nav-link">后端解决方案</a></li></ul></div></div><div class="nav-item"><a href="/pages/beb6c0bd8a66cea6/" class="nav-link">收藏</a></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="索引" class="dropdown-title"><a href="/archives/" class="link-title">索引</a> <span class="title" style="display:none;">索引</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/categories/" class="nav-link">分类</a></li><li class="dropdown-item"><!----> <a href="/tags/" class="nav-link">标签</a></li><li class="dropdown-item"><!----> <a href="/archives/" class="nav-link">归档</a></li></ul></div></div> <a href="https://github.com/linxin1123/vuepress-blog" target="_blank" rel="noopener noreferrer" class="repo-link">
    GitHub
    <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav></div></header> <div class="sidebar-mask"></div> <div class="sidebar-hover-trigger"></div> <aside class="sidebar" style="display:none;"><div class="blogger"><img src="https://lingxin-tanhua.oss-cn-shanghai.aliyuncs.com/QQ%E6%88%AA%E5%9B%BE20220503092755.png"> <div class="blogger-info"><h3>lingxin</h3> <span>凌歆</span></div></div> <nav class="nav-links"><div class="nav-item"><a href="/" class="nav-link">首页</a></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="前端" class="dropdown-title"><a href="/web/" class="link-title">前端</a> <span class="title" style="display:none;">前端</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><h4>学习笔记</h4> <ul class="dropdown-subitem-wrapper"><li class="dropdown-subitem"><a href="/note/html/" class="nav-link">HTML笔记</a></li><li class="dropdown-subitem"><a href="/note/js-low/" class="nav-link">JavaScript基础笔记</a></li><li class="dropdown-subitem"><a href="/note/js-high/" class="nav-link">JavaScript高阶笔记</a></li><li class="dropdown-subitem"><a href="/note/js-dom-bom/" class="nav-link">JavaScript DOM和BOM笔记</a></li><li class="dropdown-subitem"><a href="/note/jquery/" class="nav-link">jQuery笔记</a></li><li class="dropdown-subitem"><a href="/note/ajax/" class="nav-link">Ajax笔记</a></li><li class="dropdown-subitem"><a href="/note/nodejs/" class="nav-link">NodeJs笔记</a></li><li class="dropdown-subitem"><a href="/note/reg/" class="nav-link">正则表达式笔记</a></li><li class="dropdown-subitem"><a href="/note/vue/" class="nav-link">Vue笔记</a></li><li class="dropdown-subitem"><a href="/note/react/" class="nav-link">react笔记</a></li><li class="dropdown-subitem"><a href="/note/wx/" class="nav-link">微信小程序笔记</a></li><li class="dropdown-subitem"><a href="/note/uniapp/" class="nav-link">uniapp笔记</a></li><li class="dropdown-subitem"><a href="/note/echarts/" class="nav-link">echarts笔记</a></li><li class="dropdown-subitem"><a href="/note/git/" class="nav-link">Git笔记</a></li></ul></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="后端" class="dropdown-title"><a href="/back/" class="link-title">后端</a> <span class="title" style="display:none;">后端</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/note/java/" class="nav-link">JAVA</a></li><li class="dropdown-item"><!----> <a href="/note/javaweb/" class="nav-link">JavaWeb</a></li><li class="dropdown-item"><!----> <a href="/note/mysql/" class="nav-link">MySql</a></li><li class="dropdown-item"><!----> <a href="/note/ssm/" class="nav-link">ssm</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="算法" class="dropdown-title"><a href="/algor/" class="link-title">算法</a> <span class="title" style="display:none;">算法</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/note/sf/" class="nav-link">算法训练营</a></li><li class="dropdown-item"><!----> <a href="/note/js-sf/" class="nav-link">js数据结构与算法</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="面试" class="dropdown-title"><a href="/mianshi/" class="link-title">面试</a> <span class="title" style="display:none;">面试</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/note/lqb/" class="nav-link">蓝桥杯备战</a></li><li class="dropdown-item"><!----> <a href="/note/ms/" class="nav-link">前端面试</a></li><li class="dropdown-item"><!----> <a href="/note/hmms/" class="nav-link">黑马面试</a></li><li class="dropdown-item"><!----> <a href="/note/xzms/" class="nav-link">校招零距离面试</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="解决方案" class="dropdown-title"><a href="/resolve/" class="link-title">解决方案</a> <span class="title" style="display:none;">解决方案</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/note/qd-resolve/" class="nav-link">前端解决方案</a></li><li class="dropdown-item"><!----> <a href="/note/hd-resolve/" class="nav-link">后端解决方案</a></li></ul></div></div><div class="nav-item"><a href="/pages/beb6c0bd8a66cea6/" class="nav-link">收藏</a></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="索引" class="dropdown-title"><a href="/archives/" class="link-title">索引</a> <span class="title" style="display:none;">索引</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/categories/" class="nav-link">分类</a></li><li class="dropdown-item"><!----> <a href="/tags/" class="nav-link">标签</a></li><li class="dropdown-item"><!----> <a href="/archives/" class="nav-link">归档</a></li></ul></div></div> <a href="https://github.com/linxin1123/vuepress-blog" target="_blank" rel="noopener noreferrer" class="repo-link">
    GitHub
    <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav>  <ul class="sidebar-links"><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>学习笔记</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>Java笔记</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/pages/ee64d9/" class="sidebar-link">Java复习（一）</a></li><li><a href="/pages/659fa7/" class="sidebar-link">Java复习（二）</a></li><li><a href="/pages/c57687/" class="sidebar-link">Java io流（一）</a></li><li><a href="/pages/8ac044/" class="sidebar-link">Java io流（二）</a></li><li><a href="/pages/2d0d17/" class="sidebar-link">Java io流（三）</a></li><li><a href="/pages/e16a86/" aria-current="page" class="active sidebar-link">java-网络编程</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level2"><a href="/pages/e16a86/#_1-网络编程的定义" class="sidebar-link">1.网络编程的定义</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level3"><a href="/pages/e16a86/#_1-2-网络编程的三要素" class="sidebar-link">1.2 网络编程的三要素</a></li><li class="sidebar-sub-header level3"><a href="/pages/e16a86/#_1-3-ip地址" class="sidebar-link">1.3 IP地址</a></li><li class="sidebar-sub-header level3"><a href="/pages/e16a86/#_1-4-inet-address类" class="sidebar-link">1.4 Inet Address类</a></li><li class="sidebar-sub-header level4"><a href="/pages/e16a86/#示例" class="sidebar-link">示例</a></li><li class="sidebar-sub-header level3"><a href="/pages/e16a86/#_1-5-udp和tcp协议" class="sidebar-link">1.5 UDP和TCP协议</a></li><li class="sidebar-sub-header level4"><a href="/pages/e16a86/#udp" class="sidebar-link">UDP</a></li><li class="sidebar-sub-header level4"><a href="/pages/e16a86/#tcp" class="sidebar-link">Tcp</a></li></ul></li><li class="sidebar-sub-header level2"><a href="/pages/e16a86/#_2-java的udp通信" class="sidebar-link">2. java的UDP通信</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level4"><a href="/pages/e16a86/#发送数据" class="sidebar-link">发送数据</a></li><li class="sidebar-sub-header level4"><a href="/pages/e16a86/#接收数据" class="sidebar-link">接收数据</a></li><li class="sidebar-sub-header level4"><a href="/pages/e16a86/#接收和发送数据练习" class="sidebar-link">接收和发送数据练习</a></li></ul></li><li class="sidebar-sub-header level2"><a href="/pages/e16a86/#_3-java的tcp通信程序" class="sidebar-link">3. java的TCP通信程序</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level3"><a href="/pages/e16a86/#_3-1-tcp发送数据" class="sidebar-link">3.1 tcp发送数据</a></li><li class="sidebar-sub-header level3"><a href="/pages/e16a86/#_3-2-tcp接收数据-服务端" class="sidebar-link">3.2 tcp接收数据（服务端）</a></li><li class="sidebar-sub-header level4"><a href="/pages/e16a86/#客户端" class="sidebar-link">客户端</a></li><li class="sidebar-sub-header level4"><a href="/pages/e16a86/#服务端" class="sidebar-link">服务端</a></li><li class="sidebar-sub-header level3"><a href="/pages/e16a86/#_3-3-tcp发送和接收数据-服务器有反馈" class="sidebar-link">3.3 tcp发送和接收数据（服务器有反馈）</a></li><li class="sidebar-sub-header level3"><a href="/pages/e16a86/#_3-4-tcp发送和接收数据-输入来自键盘输入" class="sidebar-link">3.4 tcp发送和接收数据（输入来自键盘输入）</a></li><li class="sidebar-sub-header level3"><a href="/pages/e16a86/#_3-5-tcp发送和接收数据-都来自文件" class="sidebar-link">3.5 tcp发送和接收数据（都来自文件）</a></li><li class="sidebar-sub-header level3"><a href="/pages/e16a86/#_3-6-客户端告知服务端传输完毕的方法" class="sidebar-link">3.6 客户端告知服务端传输完毕的方法</a></li><li class="sidebar-sub-header level3"><a href="/pages/e16a86/#_3-7-为每个客户端都开启一个线程" class="sidebar-link">3.7 为每个客户端都开启一个线程</a></li></ul></li></ul></li><li><a href="/pages/d7d5c4/" class="sidebar-link">Java 反射和注解</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>JavaWeb笔记</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>MySql笔记</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>SSM笔记</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <div><main class="page"><div class="theme-vdoing-wrapper "><div class="articleInfo-wrap" data-v-06225672><div class="articleInfo" data-v-06225672><ul class="breadcrumbs" data-v-06225672><li data-v-06225672><a href="/" title="首页" class="iconfont icon-home router-link-active" data-v-06225672></a></li> <li data-v-06225672><a href="/back/#后端" data-v-06225672>后端</a></li><li data-v-06225672><a href="/back/#Java笔记" data-v-06225672>Java笔记</a></li></ul> <div class="info" data-v-06225672><div title="作者" class="author iconfont icon-touxiang" data-v-06225672><a href="https://github.com/linxin1123" target="_blank" title="作者" class="beLink" data-v-06225672>lingxin</a></div> <div title="创建时间" class="date iconfont icon-riqi" data-v-06225672><a href="javascript:;" data-v-06225672>2023-01-25</a></div> <!----></div></div></div> <!----> <div class="content-wrapper"><div class="right-menu-wrapper"><div class="right-menu-margin"><div class="right-menu-title">目录</div> <div class="right-menu-content"></div></div></div> <h1><img src="">java-网络编程<!----></h1>  <div class="theme-vdoing-content content__default"><h1 id="网络编程"><a href="#网络编程" class="header-anchor">#</a> 网络编程</h1> <h2 id="_1-网络编程的定义"><a href="#_1-网络编程的定义" class="header-anchor">#</a> 1.网络编程的定义</h2> <ul><li>在网络通信协议下，实现网络互联的不同计算机上运行的程序间可以进行数据交换</li></ul> <h3 id="_1-2-网络编程的三要素"><a href="#_1-2-网络编程的三要素" class="header-anchor">#</a> 1.2 网络编程的三要素</h3> <ul><li>IP地址：计算机的标识符</li> <li>端口：应用程序的标识符</li> <li>协议：计算机之间连接和通信的规则</li></ul> <h3 id="_1-3-ip地址"><a href="#_1-3-ip地址" class="header-anchor">#</a> 1.3 IP地址</h3> <ul><li><p>ipv4：32bit地址，一般用10进制点表示法，例如：192.168.1.1</p></li> <li><p>ipv6：128bit地址，8组十六进制数组成</p></li></ul> <h3 id="_1-4-inet-address类"><a href="#_1-4-inet-address类" class="header-anchor">#</a> 1.4 Inet Address类</h3> <ul><li><p>此类表示Internet协议（IP）地址</p></li> <li><p>相关方法</p></li></ul> <table><thead><tr><th>方法名</th> <th>说明</th></tr></thead> <tbody><tr><td>static inetAddress getByName(String host)</td> <td>确定主机名称的ip地址</td></tr> <tr><td>String getHostName()</td> <td>获取此IP地址的主机名</td></tr> <tr><td>String getHostAddress()</td> <td>返回文本显示的IP地址字符串</td></tr></tbody></table> <h4 id="示例"><a href="#示例" class="header-anchor">#</a> 示例</h4> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">package</span> 网络编程<span class="token punctuation">;</span>

<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>net<span class="token punctuation">.</span></span><span class="token class-name">InetAddress</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>net<span class="token punctuation">.</span></span><span class="token class-name">UnknownHostException</span></span><span class="token punctuation">;</span>

<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">Demo</span> <span class="token punctuation">{</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">UnknownHostException</span> <span class="token punctuation">{</span>

<span class="token comment">//        1.根据ip地址创建对象</span>
        <span class="token class-name">InetAddress</span> id <span class="token operator">=</span> <span class="token class-name">InetAddress</span><span class="token punctuation">.</span><span class="token function">getByName</span><span class="token punctuation">(</span><span class="token string">&quot;192.168.142.1&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">//         2.获取主机名</span>

        <span class="token class-name">String</span> hostName <span class="token operator">=</span> id<span class="token punctuation">.</span><span class="token function">getHostName</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>hostName<span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">//        3.返回文本显示的ip字符串</span>

        <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>id<span class="token punctuation">.</span><span class="token function">getHostAddress</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br></div></div><ul><li>效果图</li></ul> <p><img src="https://img-blog.csdnimg.cn/b66b9f8d3c1d4297ac1c2f139c56549c.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5YeM5q2G,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center" alt="在这里插入图片描述"></p> <h3 id="_1-5-udp和tcp协议"><a href="#_1-5-udp和tcp协议" class="header-anchor">#</a> 1.5 UDP和TCP协议</h3> <h4 id="udp"><a href="#udp" class="header-anchor">#</a> UDP</h4> <ul><li>无连接通信协议，发送端和接收端不产生逻辑链接，发送端不会确认接收端的存在，发送数据报，接收端接收数据也不会有反馈</li></ul> <h4 id="tcp"><a href="#tcp" class="header-anchor">#</a> Tcp</h4> <ul><li>传输控制协议</li> <li>三次握手</li></ul> <h2 id="_2-java的udp通信"><a href="#_2-java的udp通信" class="header-anchor">#</a> 2. java的UDP通信</h2> <ul><li><p>DategramSocket类</p></li> <li><p>构造方法</p></li></ul> <table><thead><tr><th>方法名</th> <th>说明</th></tr></thead> <tbody><tr><td>DategramSocket()</td> <td>创建数据报文绑定到本地地址的任何可用端口</td></tr> <tr><td>DategramPacket(byte[] buf,int length,InetAddress address,int port)</td> <td>构造一个数据包，发送长度为 <code>length</code>的数据包到指定主机上的指定端口号。</td></tr></tbody></table> <ul><li>相关方法</li></ul> <table><thead><tr><th>方法名</th> <th>说明</th></tr></thead> <tbody><tr><td>void send(DatagramPacket p)</td> <td>发送数据报包</td></tr> <tr><td>void close()</td> <td>关闭数据报套接字</td></tr> <tr><td>void receive(DatagramPacket p)</td> <td>接收数据报包</td></tr></tbody></table> <h4 id="发送数据"><a href="#发送数据" class="header-anchor">#</a> 发送数据</h4> <ol><li>创建DategramSocket对象</li> <li>创建数据，打包（DategramPacket）</li> <li>调用DategramSocket的send方法</li> <li>关闭发送端</li></ol> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">package</span> 网络编程<span class="token punctuation">;</span>

<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span><span class="token class-name">IOException</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>net<span class="token punctuation">.</span></span><span class="token operator">*</span></span><span class="token punctuation">;</span>

<span class="token keyword">public</span> <span class="token keyword">class</span> sendDemo <span class="token punctuation">{</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">IOException</span> <span class="token punctuation">{</span>
<span class="token comment">//        1.创建DatagramSocket 对象</span>
        <span class="token class-name">DatagramSocket</span> ds <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">DatagramSocket</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">//        2.创建数据</span>

        <span class="token keyword">byte</span> <span class="token punctuation">[</span><span class="token punctuation">]</span>bys<span class="token operator">=</span><span class="token string">&quot;hello world&quot;</span><span class="token punctuation">.</span><span class="token function">getBytes</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">//        3.创建DatagramPacket对象</span>

        <span class="token class-name">DatagramPacket</span> dp <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">DatagramPacket</span><span class="token punctuation">(</span>bys<span class="token punctuation">,</span>bys<span class="token punctuation">.</span>length<span class="token punctuation">,</span> <span class="token class-name">InetAddress</span><span class="token punctuation">.</span><span class="token function">getByName</span><span class="token punctuation">(</span><span class="token string">&quot;192.168.142.1&quot;</span><span class="token punctuation">)</span><span class="token punctuation">,</span><span class="token number">12345</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">//        4.调用send方法</span>
        ds<span class="token punctuation">.</span><span class="token function">send</span><span class="token punctuation">(</span>dp<span class="token punctuation">)</span><span class="token punctuation">;</span>

    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br></div></div><h4 id="接收数据"><a href="#接收数据" class="header-anchor">#</a> 接收数据</h4> <ul><li>构造方法</li></ul> <table><thead><tr><th>方法名</th> <th>说明</th></tr></thead> <tbody><tr><td>DategramPacket(byte[] buf,int len)</td> <td>创建一个DategramPacket用于接收长度为len的数据包</td></tr></tbody></table> <ul><li>相关方法</li></ul> <table><thead><tr><th>方法名</th> <th>说明</th></tr></thead> <tbody><tr><td>byte[] getData()</td> <td>返回数据缓冲区</td></tr> <tr><td>int getLength()</td> <td>返回要发送数据的长度或接收数据的长度</td></tr></tbody></table> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">package</span> 网络编程<span class="token punctuation">;</span>

<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span><span class="token class-name">IOException</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>net<span class="token punctuation">.</span></span><span class="token class-name">DatagramPacket</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>net<span class="token punctuation">.</span></span><span class="token class-name">DatagramSocket</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>net<span class="token punctuation">.</span></span><span class="token class-name">SocketException</span></span><span class="token punctuation">;</span>

<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">ReceiveDemo</span> <span class="token punctuation">{</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">IOException</span> <span class="token punctuation">{</span>
<span class="token comment">//        1.创建接收数据包的DatagramSocket对象</span>

        <span class="token class-name">DatagramSocket</span> ds <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">DatagramSocket</span><span class="token punctuation">(</span><span class="token number">12345</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">//        2.创建接收数据包</span>

        <span class="token keyword">byte</span><span class="token punctuation">[</span><span class="token punctuation">]</span> bys <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token keyword">byte</span><span class="token punctuation">[</span><span class="token number">1024</span><span class="token punctuation">]</span><span class="token punctuation">;</span>

        <span class="token class-name">DatagramPacket</span> dp <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">DatagramPacket</span><span class="token punctuation">(</span>bys<span class="token punctuation">,</span>bys<span class="token punctuation">.</span>length<span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">//      3.调用接收方法</span>
        ds<span class="token punctuation">.</span><span class="token function">receive</span><span class="token punctuation">(</span>dp<span class="token punctuation">)</span><span class="token punctuation">;</span>

        <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">String</span><span class="token punctuation">(</span>dp<span class="token punctuation">.</span><span class="token function">getData</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span><span class="token number">0</span><span class="token punctuation">,</span>dp<span class="token punctuation">.</span><span class="token function">getLength</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">//        4.关闭接收端</span>

        ds<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br></div></div><ul><li>效果图</li></ul> <p><img src="https://img-blog.csdnimg.cn/0696e1bb1e344830a3241c99eec0c5ef.gif#pic_center" alt="在这里插入图片描述"></p> <h4 id="接收和发送数据练习"><a href="#接收和发送数据练习" class="header-anchor">#</a> 接收和发送数据练习</h4> <ul><li><p>接收端一直接收数据</p></li> <li><p>发送端当键盘输入为886时停止发送</p></li> <li><p>发送端</p></li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">package</span> 网络编程<span class="token punctuation">.</span>udp通信练习<span class="token punctuation">;</span>

<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span><span class="token class-name">BufferedReader</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span><span class="token class-name">IOException</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span><span class="token class-name">InputStreamReader</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>net<span class="token punctuation">.</span></span><span class="token class-name">DatagramPacket</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>net<span class="token punctuation">.</span></span><span class="token class-name">DatagramSocket</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>net<span class="token punctuation">.</span></span><span class="token class-name">InetAddress</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>net<span class="token punctuation">.</span></span><span class="token class-name">UnknownHostException</span></span><span class="token punctuation">;</span>

<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">SendDemo</span> <span class="token punctuation">{</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">IOException</span> <span class="token punctuation">{</span>

<span class="token comment">//        1.创建发送Ds</span>

        <span class="token class-name">DatagramSocket</span> ds <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">DatagramSocket</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">//        发送数据来自键盘输入，知道键盘输入为886才停止发送</span>

        <span class="token class-name">BufferedReader</span> br <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BufferedReader</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">InputStreamReader</span><span class="token punctuation">(</span><span class="token class-name">System</span><span class="token punctuation">.</span>in<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

        <span class="token class-name">String</span> str<span class="token punctuation">;</span>



        <span class="token keyword">while</span><span class="token punctuation">(</span><span class="token punctuation">(</span>str<span class="token operator">=</span>br<span class="token punctuation">.</span><span class="token function">readLine</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token operator">!=</span><span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token keyword">if</span><span class="token punctuation">(</span>str<span class="token punctuation">.</span><span class="token function">equals</span><span class="token punctuation">(</span><span class="token string">&quot;886&quot;</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
                <span class="token keyword">break</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span><span class="token keyword">else</span><span class="token punctuation">{</span>
<span class="token comment">//                3.创建发送数据包</span>

                <span class="token keyword">byte</span><span class="token punctuation">[</span><span class="token punctuation">]</span> bys<span class="token operator">=</span>str<span class="token punctuation">.</span><span class="token function">getBytes</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

                <span class="token class-name">DatagramPacket</span> dp <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">DatagramPacket</span><span class="token punctuation">(</span>bys<span class="token punctuation">,</span>bys<span class="token punctuation">.</span>length<span class="token punctuation">,</span> <span class="token class-name">InetAddress</span><span class="token punctuation">.</span><span class="token function">getByName</span><span class="token punctuation">(</span><span class="token string">&quot;10.152.242.223&quot;</span><span class="token punctuation">)</span><span class="token punctuation">,</span><span class="token number">12345</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

                ds<span class="token punctuation">.</span><span class="token function">send</span><span class="token punctuation">(</span>dp<span class="token punctuation">)</span><span class="token punctuation">;</span>


            <span class="token punctuation">}</span>
        <span class="token punctuation">}</span>

        ds<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br></div></div><ul><li>接收端</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">package</span> 网络编程<span class="token punctuation">.</span>udp通信练习<span class="token punctuation">;</span>

<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span><span class="token class-name">IOException</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>net<span class="token punctuation">.</span></span><span class="token class-name">DatagramPacket</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>net<span class="token punctuation">.</span></span><span class="token class-name">DatagramSocket</span></span><span class="token punctuation">;</span>

<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">ReceiveDemo</span> <span class="token punctuation">{</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">IOException</span> <span class="token punctuation">{</span>
<span class="token comment">//        1.创建接收DatagramSocket</span>
        <span class="token class-name">DatagramSocket</span> ds <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">DatagramSocket</span><span class="token punctuation">(</span><span class="token number">12345</span><span class="token punctuation">)</span><span class="token punctuation">;</span>


<span class="token comment">//        2.创建接收数据包</span>
        <span class="token keyword">while</span><span class="token punctuation">(</span><span class="token boolean">true</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token keyword">byte</span><span class="token punctuation">[</span><span class="token punctuation">]</span> bys <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token keyword">byte</span><span class="token punctuation">[</span><span class="token number">1024</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
            <span class="token class-name">DatagramPacket</span> dp <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">DatagramPacket</span><span class="token punctuation">(</span>bys<span class="token punctuation">,</span>bys<span class="token punctuation">.</span>length<span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">//        3.调用接收方法</span>
            ds<span class="token punctuation">.</span><span class="token function">receive</span><span class="token punctuation">(</span>dp<span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">//            4.输出数据</span>

            <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">String</span><span class="token punctuation">(</span>dp<span class="token punctuation">.</span><span class="token function">getData</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span><span class="token number">0</span><span class="token punctuation">,</span>dp<span class="token punctuation">.</span><span class="token function">getLength</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

        <span class="token punctuation">}</span>




    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br></div></div><ul><li>效果图</li></ul> <p><img src="https://img-blog.csdnimg.cn/c73a29e9300c443eaa65728c39a646ea.gif#pic_center" alt="在这里插入图片描述"></p> <h2 id="_3-java的tcp通信程序"><a href="#_3-java的tcp通信程序" class="header-anchor">#</a> 3. java的TCP通信程序</h2> <ul><li>java为客户端提供了Socket类，为服务器提供了ServerSocket类</li></ul> <h3 id="_3-1-tcp发送数据"><a href="#_3-1-tcp发送数据" class="header-anchor">#</a> 3.1 tcp发送数据</h3> <ul><li>构造方法</li></ul> <table><thead><tr><th>方法名</th> <th>说明</th></tr></thead> <tbody><tr><td>Socket(InetAddress address,int port)</td> <td>创建流套接字并将其连接到指定IP指定端口号</td></tr> <tr><td>Socket(String host,int port)</td> <td>创建流套接字并将其连接到指定主机的指定端口号</td></tr></tbody></table> <ul><li>相关方法</li></ul> <table><thead><tr><th>方法名</th> <th>说明</th></tr></thead> <tbody><tr><td>InputStream getInputStream()</td> <td>返回此套接字的1输入流</td></tr> <tr><td>OutputStream getOutputStream()</td> <td>返回此套接字的输出流</td></tr></tbody></table> <h3 id="_3-2-tcp接收数据-服务端"><a href="#_3-2-tcp接收数据-服务端" class="header-anchor">#</a> 3.2 tcp接收数据（服务端）</h3> <ul><li>构造方法</li></ul> <table><thead><tr><th>方法名</th> <th>说明</th></tr></thead> <tbody><tr><td>ServletSocket(int port)</td> <td>创建绑定到指定端口的服务器套接字</td></tr></tbody></table> <ul><li>相关方法</li></ul> <table><thead><tr><th>方法名</th> <th>说明</th></tr></thead> <tbody><tr><td>Socket accept()</td> <td>监听要连接到此套接字并接收它</td></tr></tbody></table> <h4 id="客户端"><a href="#客户端" class="header-anchor">#</a> 客户端</h4> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">package</span> 网络编程<span class="token punctuation">.</span>tcp通信<span class="token punctuation">;</span>

<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span><span class="token class-name">IOException</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span><span class="token class-name">OutputStream</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>net<span class="token punctuation">.</span></span><span class="token class-name">Socket</span></span><span class="token punctuation">;</span>

<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">ClientDemo</span> <span class="token punctuation">{</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">IOException</span> <span class="token punctuation">{</span>
<span class="token comment">//        1.创建客户端的tcp通信</span>
        <span class="token class-name">Socket</span> s <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Socket</span><span class="token punctuation">(</span><span class="token string">&quot;10.152.242.223&quot;</span><span class="token punctuation">,</span> <span class="token number">12345</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">//        2.获取输出流</span>

        <span class="token class-name">OutputStream</span> os <span class="token operator">=</span> s<span class="token punctuation">.</span><span class="token function">getOutputStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">//        3.写数据</span>
        os<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">&quot;hello.world&quot;</span><span class="token punctuation">.</span><span class="token function">getBytes</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

        s<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br></div></div><h4 id="服务端"><a href="#服务端" class="header-anchor">#</a> 服务端</h4> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">package</span> 网络编程<span class="token punctuation">.</span>tcp通信<span class="token punctuation">;</span>

<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span><span class="token class-name">IOException</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span><span class="token class-name">InputStream</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>net<span class="token punctuation">.</span></span><span class="token class-name">ServerSocket</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>net<span class="token punctuation">.</span></span><span class="token class-name">Socket</span></span><span class="token punctuation">;</span>

<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">ServerDemo</span> <span class="token punctuation">{</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">IOException</span> <span class="token punctuation">{</span>
<span class="token comment">//        1.服务器端</span>

        <span class="token class-name">ServerSocket</span> ss<span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ServerSocket</span><span class="token punctuation">(</span><span class="token number">12345</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">//        2.获取输入流</span>

<span class="token comment">//        使用ss.accept()方法连接此套接字并接收</span>

        <span class="token class-name">Socket</span> s <span class="token operator">=</span> ss<span class="token punctuation">.</span><span class="token function">accept</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">//          获取输入流</span>
        <span class="token class-name">InputStream</span> is <span class="token operator">=</span> s<span class="token punctuation">.</span><span class="token function">getInputStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

        <span class="token keyword">byte</span><span class="token punctuation">[</span><span class="token punctuation">]</span> bys <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token keyword">byte</span><span class="token punctuation">[</span><span class="token number">1024</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
        <span class="token keyword">int</span> len<span class="token punctuation">;</span>
        <span class="token keyword">while</span><span class="token punctuation">(</span><span class="token punctuation">(</span>len<span class="token operator">=</span>is<span class="token punctuation">.</span><span class="token function">read</span><span class="token punctuation">(</span>bys<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token operator">!=</span><span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token class-name">String</span> s1 <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">String</span><span class="token punctuation">(</span>bys<span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> len<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">&quot;接收的数据为&quot;</span><span class="token operator">+</span>s1<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>

        s<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        ss<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br></div></div><ul><li>效果图</li></ul> <p><img src="https://img-blog.csdnimg.cn/fe19b0ab37be4ac2b105932d7a9aa2b7.gif#pic_center" alt="在这里插入图片描述"></p> <h3 id="_3-3-tcp发送和接收数据-服务器有反馈"><a href="#_3-3-tcp发送和接收数据-服务器有反馈" class="header-anchor">#</a> 3.3 tcp发送和接收数据（服务器有反馈）</h3> <ul><li>客户端</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">package</span> 网络编程<span class="token punctuation">.</span>tcp通信<span class="token punctuation">;</span>

<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span><span class="token class-name">IOException</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span><span class="token class-name">InputStream</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span><span class="token class-name">OutputStream</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>net<span class="token punctuation">.</span></span><span class="token class-name">Socket</span></span><span class="token punctuation">;</span>

<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">ClientDemo</span> <span class="token punctuation">{</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">IOException</span> <span class="token punctuation">{</span>
<span class="token comment">//        1.创建客户端的tcp通信</span>
        <span class="token class-name">Socket</span> s <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Socket</span><span class="token punctuation">(</span><span class="token string">&quot;10.152.242.223&quot;</span><span class="token punctuation">,</span> <span class="token number">12345</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">//        2.获取输出流</span>

        <span class="token class-name">OutputStream</span> os <span class="token operator">=</span> s<span class="token punctuation">.</span><span class="token function">getOutputStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">//        3.写数据</span>
        os<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">&quot;hello.world&quot;</span><span class="token punctuation">.</span><span class="token function">getBytes</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>


    <span class="token comment">//    客户端接收服务端的反馈</span>

        <span class="token class-name">InputStream</span> is <span class="token operator">=</span> s<span class="token punctuation">.</span><span class="token function">getInputStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">byte</span><span class="token punctuation">[</span><span class="token punctuation">]</span> bys <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token keyword">byte</span><span class="token punctuation">[</span><span class="token number">1024</span><span class="token punctuation">]</span><span class="token punctuation">;</span>

        <span class="token keyword">int</span> len<span class="token punctuation">;</span>
        len<span class="token operator">=</span>is<span class="token punctuation">.</span><span class="token function">read</span><span class="token punctuation">(</span>bys<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">&quot;服务器的反馈:&quot;</span><span class="token operator">+</span><span class="token keyword">new</span> <span class="token class-name">String</span><span class="token punctuation">(</span>bys<span class="token punctuation">,</span><span class="token number">0</span><span class="token punctuation">,</span>len<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        s<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br></div></div><ul><li>服务端</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">package</span> 网络编程<span class="token punctuation">.</span>tcp通信<span class="token punctuation">;</span>

<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span><span class="token class-name">IOException</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span><span class="token class-name">InputStream</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span><span class="token class-name">OutputStream</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>net<span class="token punctuation">.</span></span><span class="token class-name">ServerSocket</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>net<span class="token punctuation">.</span></span><span class="token class-name">Socket</span></span><span class="token punctuation">;</span>

<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">ServerDemo</span> <span class="token punctuation">{</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">IOException</span> <span class="token punctuation">{</span>
<span class="token comment">//        1.服务器端</span>

        <span class="token class-name">ServerSocket</span> ss<span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ServerSocket</span><span class="token punctuation">(</span><span class="token number">12345</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">//        2.获取输入流</span>

<span class="token comment">//        使用ss.accept()方法连接此套接字并接收</span>

        <span class="token class-name">Socket</span> s <span class="token operator">=</span> ss<span class="token punctuation">.</span><span class="token function">accept</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">//          获取输入流</span>
        <span class="token class-name">InputStream</span> is <span class="token operator">=</span> s<span class="token punctuation">.</span><span class="token function">getInputStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

        <span class="token keyword">byte</span><span class="token punctuation">[</span><span class="token punctuation">]</span> bys <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token keyword">byte</span><span class="token punctuation">[</span><span class="token number">1024</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
        <span class="token keyword">int</span> len<span class="token punctuation">;</span>
        len<span class="token operator">=</span>is<span class="token punctuation">.</span><span class="token function">read</span><span class="token punctuation">(</span>bys<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token class-name">String</span> s1 <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">String</span><span class="token punctuation">(</span>bys<span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> len<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">&quot;接收的数据为&quot;</span><span class="token operator">+</span>s1<span class="token punctuation">)</span><span class="token punctuation">;</span>


        <span class="token comment">//写反馈给客户端</span>

        <span class="token class-name">OutputStream</span> os <span class="token operator">=</span> s<span class="token punctuation">.</span><span class="token function">getOutputStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        os<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">&quot;数据已经接收&quot;</span><span class="token punctuation">.</span><span class="token function">getBytes</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>


        s<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        ss<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br></div></div><ul><li>效果图</li></ul> <p><img src="https://img-blog.csdnimg.cn/b6aa1574f044405db27c27f57496d6af.gif#pic_center" alt="在这里插入图片描述"></p> <h3 id="_3-4-tcp发送和接收数据-输入来自键盘输入"><a href="#_3-4-tcp发送和接收数据-输入来自键盘输入" class="header-anchor">#</a> 3.4 tcp发送和接收数据（输入来自键盘输入）</h3> <ul><li>客户端</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">package</span> 网络编程<span class="token punctuation">.</span>tcp通信<span class="token punctuation">;</span>

<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span><span class="token operator">*</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>net<span class="token punctuation">.</span></span><span class="token class-name">Socket</span></span><span class="token punctuation">;</span>

<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">ClientDemo</span> <span class="token punctuation">{</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">IOException</span> <span class="token punctuation">{</span>
<span class="token comment">//        1.创建客户端的tcp通信</span>
        <span class="token class-name">Socket</span> s <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Socket</span><span class="token punctuation">(</span><span class="token string">&quot;10.152.242.223&quot;</span><span class="token punctuation">,</span> <span class="token number">12345</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">//        2.获取输出流</span>

        <span class="token class-name">OutputStream</span> os <span class="token operator">=</span> s<span class="token punctuation">.</span><span class="token function">getOutputStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">//        3.写数据</span>

        <span class="token comment">//数据来源键盘输入</span>
        <span class="token class-name">BufferedReader</span> br <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BufferedReader</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">InputStreamReader</span><span class="token punctuation">(</span><span class="token class-name">System</span><span class="token punctuation">.</span>in<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token class-name">BufferedWriter</span> bw <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BufferedWriter</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">OutputStreamWriter</span><span class="token punctuation">(</span>os<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">//os.write(&quot;hello.world&quot;.getBytes());</span>

        <span class="token class-name">String</span> str<span class="token punctuation">;</span>
        <span class="token keyword">while</span><span class="token punctuation">(</span><span class="token punctuation">(</span>str<span class="token operator">=</span>br<span class="token punctuation">.</span><span class="token function">readLine</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token operator">!=</span><span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token comment">//如果键盘输入886，停止发送</span>
            <span class="token keyword">if</span><span class="token punctuation">(</span>str<span class="token punctuation">.</span><span class="token function">equals</span><span class="token punctuation">(</span><span class="token string">&quot;886&quot;</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
                <span class="token keyword">break</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span><span class="token keyword">else</span><span class="token punctuation">{</span>
                bw<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span>str<span class="token punctuation">)</span><span class="token punctuation">;</span>
                bw<span class="token punctuation">.</span><span class="token function">newLine</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                bw<span class="token punctuation">.</span><span class="token function">flush</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
        <span class="token punctuation">}</span>


    <span class="token comment">//    客户端接收服务端的反馈</span>

        <span class="token class-name">InputStream</span> is <span class="token operator">=</span> s<span class="token punctuation">.</span><span class="token function">getInputStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">byte</span><span class="token punctuation">[</span><span class="token punctuation">]</span> bys <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token keyword">byte</span><span class="token punctuation">[</span><span class="token number">1024</span><span class="token punctuation">]</span><span class="token punctuation">;</span>

        <span class="token keyword">int</span> len<span class="token punctuation">;</span>
        len<span class="token operator">=</span>is<span class="token punctuation">.</span><span class="token function">read</span><span class="token punctuation">(</span>bys<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">&quot;服务器的反馈:&quot;</span><span class="token operator">+</span><span class="token keyword">new</span> <span class="token class-name">String</span><span class="token punctuation">(</span>bys<span class="token punctuation">,</span><span class="token number">0</span><span class="token punctuation">,</span>len<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        s<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br></div></div><ul><li>服务端</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">package</span> 网络编程<span class="token punctuation">.</span>tcp通信<span class="token punctuation">;</span>

<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span><span class="token operator">*</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>net<span class="token punctuation">.</span></span><span class="token class-name">ServerSocket</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>net<span class="token punctuation">.</span></span><span class="token class-name">Socket</span></span><span class="token punctuation">;</span>

<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">ServerDemo</span> <span class="token punctuation">{</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">IOException</span> <span class="token punctuation">{</span>
<span class="token comment">//        1.服务器端</span>

        <span class="token class-name">ServerSocket</span> ss<span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ServerSocket</span><span class="token punctuation">(</span><span class="token number">12345</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">//        2.获取输入流</span>

<span class="token comment">//        使用ss.accept()方法连接此套接字并接收</span>

        <span class="token class-name">Socket</span> s <span class="token operator">=</span> ss<span class="token punctuation">.</span><span class="token function">accept</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">//          获取输入流</span>
        <span class="token class-name">InputStream</span> is <span class="token operator">=</span> s<span class="token punctuation">.</span><span class="token function">getInputStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

        <span class="token comment">//byte[] bys = new byte[1024];</span>
        <span class="token comment">//int len;</span>
        <span class="token comment">//len=is.read(bys);</span>
        <span class="token comment">//String s1 = new String(bys, 0, len);</span>
        <span class="token comment">//System.out.println(&quot;接收的数据为&quot;+s1);</span>

        <span class="token comment">//通过字符流读数据</span>

        <span class="token class-name">BufferedReader</span> br <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BufferedReader</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">InputStreamReader</span><span class="token punctuation">(</span>is<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token class-name">String</span> str<span class="token punctuation">;</span>
        <span class="token keyword">while</span><span class="token punctuation">(</span><span class="token punctuation">(</span>str<span class="token operator">=</span>br<span class="token punctuation">.</span><span class="token function">readLine</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token operator">!=</span><span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>str<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>


        <span class="token comment">//写反馈给客户端</span>

        <span class="token class-name">OutputStream</span> os <span class="token operator">=</span> s<span class="token punctuation">.</span><span class="token function">getOutputStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        os<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">&quot;数据已经接收&quot;</span><span class="token punctuation">.</span><span class="token function">getBytes</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>


        s<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        ss<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br></div></div><ul><li>效果图</li></ul> <p><img src="https://img-blog.csdnimg.cn/242a0a35b1c049b8a582c27384ccbaaf.gif#pic_center" alt="在这里插入图片描述"></p> <h3 id="_3-5-tcp发送和接收数据-都来自文件"><a href="#_3-5-tcp发送和接收数据-都来自文件" class="header-anchor">#</a> 3.5 tcp发送和接收数据（都来自文件）</h3> <ul><li>客户端</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">package</span> 网络编程<span class="token punctuation">.</span>tcp通信<span class="token punctuation">;</span>

<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span><span class="token operator">*</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>net<span class="token punctuation">.</span></span><span class="token class-name">Socket</span></span><span class="token punctuation">;</span>

<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">ClientDemo</span> <span class="token punctuation">{</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">IOException</span> <span class="token punctuation">{</span>
<span class="token comment">//        1.创建客户端的tcp通信</span>
        <span class="token class-name">Socket</span> s <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Socket</span><span class="token punctuation">(</span><span class="token string">&quot;10.152.242.223&quot;</span><span class="token punctuation">,</span> <span class="token number">12345</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">//        2.获取输出流</span>

        <span class="token class-name">OutputStream</span> os <span class="token operator">=</span> s<span class="token punctuation">.</span><span class="token function">getOutputStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">//        3.写数据</span>

        <span class="token comment">//数据来源键盘输入</span>
        <span class="token comment">//BufferedReader br = new BufferedReader(new InputStreamReader(System.in));</span>
        <span class="token class-name">BufferedWriter</span> bw <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BufferedWriter</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">OutputStreamWriter</span><span class="token punctuation">(</span>os<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">//os.write(&quot;hello.world&quot;.getBytes());</span>

        <span class="token comment">//数据来源于文件</span>
        <span class="token class-name">BufferedReader</span> br <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BufferedReader</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">FileReader</span><span class="token punctuation">(</span><span class="token string">&quot;code\\13.txt&quot;</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>



        <span class="token class-name">String</span> str<span class="token punctuation">;</span>
        <span class="token keyword">while</span><span class="token punctuation">(</span><span class="token punctuation">(</span>str<span class="token operator">=</span>br<span class="token punctuation">.</span><span class="token function">readLine</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token operator">!=</span><span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token comment">//如果键盘输入886，停止发送</span>
            <span class="token comment">//if(str.equals(&quot;886&quot;)){</span>
            <span class="token comment">//    break;</span>
            <span class="token comment">//}else{</span>
                bw<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span>str<span class="token punctuation">)</span><span class="token punctuation">;</span>
                bw<span class="token punctuation">.</span><span class="token function">newLine</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                bw<span class="token punctuation">.</span><span class="token function">flush</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token comment">//}</span>
        <span class="token punctuation">}</span>


    <span class="token comment">//    客户端接收服务端的反馈</span>

        <span class="token class-name">InputStream</span> is <span class="token operator">=</span> s<span class="token punctuation">.</span><span class="token function">getInputStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">byte</span><span class="token punctuation">[</span><span class="token punctuation">]</span> bys <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token keyword">byte</span><span class="token punctuation">[</span><span class="token number">1024</span><span class="token punctuation">]</span><span class="token punctuation">;</span>

        <span class="token keyword">int</span> len<span class="token punctuation">;</span>
        len<span class="token operator">=</span>is<span class="token punctuation">.</span><span class="token function">read</span><span class="token punctuation">(</span>bys<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">&quot;服务器的反馈:&quot;</span><span class="token operator">+</span><span class="token keyword">new</span> <span class="token class-name">String</span><span class="token punctuation">(</span>bys<span class="token punctuation">,</span><span class="token number">0</span><span class="token punctuation">,</span>len<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        s<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br></div></div><ul><li>服务端</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">package</span> 网络编程<span class="token punctuation">.</span>tcp通信<span class="token punctuation">;</span>

<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span><span class="token operator">*</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>net<span class="token punctuation">.</span></span><span class="token class-name">ServerSocket</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>net<span class="token punctuation">.</span></span><span class="token class-name">Socket</span></span><span class="token punctuation">;</span>

<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">ServerDemo</span> <span class="token punctuation">{</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">IOException</span> <span class="token punctuation">{</span>
<span class="token comment">//        1.服务器端</span>

        <span class="token class-name">ServerSocket</span> ss<span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ServerSocket</span><span class="token punctuation">(</span><span class="token number">12345</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">//        2.获取输入流</span>

<span class="token comment">//        使用ss.accept()方法连接此套接字并接收</span>

        <span class="token class-name">Socket</span> s <span class="token operator">=</span> ss<span class="token punctuation">.</span><span class="token function">accept</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">//          获取输入流</span>
        <span class="token class-name">InputStream</span> is <span class="token operator">=</span> s<span class="token punctuation">.</span><span class="token function">getInputStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

        <span class="token comment">//byte[] bys = new byte[1024];</span>
        <span class="token comment">//int len;</span>
        <span class="token comment">//len=is.read(bys);</span>
        <span class="token comment">//String s1 = new String(bys, 0, len);</span>
        <span class="token comment">//System.out.println(&quot;接收的数据为&quot;+s1);</span>

        <span class="token comment">//通过字符流读数据</span>

        <span class="token class-name">BufferedReader</span> br <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BufferedReader</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">InputStreamReader</span><span class="token punctuation">(</span>is<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token class-name">String</span> str<span class="token punctuation">;</span>

        <span class="token comment">//数据写入文件</span>
        <span class="token class-name">BufferedWriter</span> bw <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BufferedWriter</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">FileWriter</span><span class="token punctuation">(</span><span class="token string">&quot;code\\14.txt&quot;</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">while</span><span class="token punctuation">(</span><span class="token punctuation">(</span>str<span class="token operator">=</span>br<span class="token punctuation">.</span><span class="token function">readLine</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token operator">!=</span><span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token comment">//System.out.println(str);</span>
            bw<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span>str<span class="token punctuation">)</span><span class="token punctuation">;</span>
            bw<span class="token punctuation">.</span><span class="token function">newLine</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            bw<span class="token punctuation">.</span><span class="token function">flush</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>


        <span class="token comment">//写反馈给客户端</span>

        <span class="token class-name">OutputStream</span> os <span class="token operator">=</span> s<span class="token punctuation">.</span><span class="token function">getOutputStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        os<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">&quot;数据已经接收&quot;</span><span class="token punctuation">.</span><span class="token function">getBytes</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>


        s<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        ss<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br></div></div><ul><li>效果图</li></ul> <p><img src="https://img-blog.csdnimg.cn/54d58765b92e4f2f90738f04f1927f65.gif#pic_center" alt="在这里插入图片描述"></p> <h3 id="_3-6-客户端告知服务端传输完毕的方法"><a href="#_3-6-客户端告知服务端传输完毕的方法" class="header-anchor">#</a> 3.6 客户端告知服务端传输完毕的方法</h3> <ul><li>相关方法</li></ul> <table><thead><tr><th>方法名</th> <th>说明</th></tr></thead> <tbody><tr><td>void shutdownInput()</td> <td>将此套接字的输入流放置在流的末尾</td></tr> <tr><td>void shutdownOutput()</td> <td>禁止用此套接字的输出流</td></tr></tbody></table> <ul><li>客户端</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">package</span> 网络编程<span class="token punctuation">.</span>tcp通信<span class="token punctuation">;</span>

<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span><span class="token operator">*</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>net<span class="token punctuation">.</span></span><span class="token class-name">Socket</span></span><span class="token punctuation">;</span>

<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">ClientDemo</span> <span class="token punctuation">{</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">IOException</span> <span class="token punctuation">{</span>
<span class="token comment">//        1.创建客户端的tcp通信</span>
        <span class="token class-name">Socket</span> s <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Socket</span><span class="token punctuation">(</span><span class="token string">&quot;10.152.242.223&quot;</span><span class="token punctuation">,</span> <span class="token number">12345</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">//        2.获取输出流</span>

        <span class="token class-name">OutputStream</span> os <span class="token operator">=</span> s<span class="token punctuation">.</span><span class="token function">getOutputStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">//        3.写数据</span>

        <span class="token comment">//数据来源键盘输入</span>
        <span class="token comment">//BufferedReader br = new BufferedReader(new InputStreamReader(System.in));</span>
        <span class="token class-name">BufferedWriter</span> bw <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BufferedWriter</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">OutputStreamWriter</span><span class="token punctuation">(</span>os<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">//os.write(&quot;hello.world&quot;.getBytes());</span>

        <span class="token comment">//数据来源于文件</span>
        <span class="token class-name">BufferedReader</span> br <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BufferedReader</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">FileReader</span><span class="token punctuation">(</span><span class="token string">&quot;code\\13.txt&quot;</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>



        <span class="token class-name">String</span> str<span class="token punctuation">;</span>
        <span class="token keyword">while</span><span class="token punctuation">(</span><span class="token punctuation">(</span>str<span class="token operator">=</span>br<span class="token punctuation">.</span><span class="token function">readLine</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token operator">!=</span><span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token comment">//如果键盘输入886，停止发送</span>
            <span class="token comment">//if(str.equals(&quot;886&quot;)){</span>
            <span class="token comment">//    break;</span>
            <span class="token comment">//}else{</span>
                bw<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span>str<span class="token punctuation">)</span><span class="token punctuation">;</span>
                bw<span class="token punctuation">.</span><span class="token function">newLine</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                bw<span class="token punctuation">.</span><span class="token function">flush</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token comment">//}</span>
        <span class="token punctuation">}</span>

        <span class="token comment">//告知服务端传输完毕</span>
        s<span class="token punctuation">.</span><span class="token function">shutdownOutput</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>


    <span class="token comment">//    客户端接收服务端的反馈</span>

        <span class="token class-name">InputStream</span> is <span class="token operator">=</span> s<span class="token punctuation">.</span><span class="token function">getInputStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">byte</span><span class="token punctuation">[</span><span class="token punctuation">]</span> bys <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token keyword">byte</span><span class="token punctuation">[</span><span class="token number">1024</span><span class="token punctuation">]</span><span class="token punctuation">;</span>

        <span class="token keyword">int</span> len<span class="token punctuation">;</span>
        len<span class="token operator">=</span>is<span class="token punctuation">.</span><span class="token function">read</span><span class="token punctuation">(</span>bys<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">&quot;服务器的反馈:&quot;</span><span class="token operator">+</span><span class="token keyword">new</span> <span class="token class-name">String</span><span class="token punctuation">(</span>bys<span class="token punctuation">,</span><span class="token number">0</span><span class="token punctuation">,</span>len<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        s<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br></div></div><ul><li>服务端</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">package</span> 网络编程<span class="token punctuation">.</span>tcp通信<span class="token punctuation">;</span>

<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span><span class="token operator">*</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>net<span class="token punctuation">.</span></span><span class="token class-name">ServerSocket</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>net<span class="token punctuation">.</span></span><span class="token class-name">Socket</span></span><span class="token punctuation">;</span>

<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">ServerDemo</span> <span class="token punctuation">{</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">IOException</span> <span class="token punctuation">{</span>
<span class="token comment">//        1.服务器端</span>

        <span class="token class-name">ServerSocket</span> ss<span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ServerSocket</span><span class="token punctuation">(</span><span class="token number">12345</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">//        2.获取输入流</span>

<span class="token comment">//        使用ss.accept()方法连接此套接字并接收</span>

        <span class="token class-name">Socket</span> s <span class="token operator">=</span> ss<span class="token punctuation">.</span><span class="token function">accept</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">//          获取输入流</span>
        <span class="token class-name">InputStream</span> is <span class="token operator">=</span> s<span class="token punctuation">.</span><span class="token function">getInputStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

        <span class="token comment">//byte[] bys = new byte[1024];</span>
        <span class="token comment">//int len;</span>
        <span class="token comment">//len=is.read(bys);</span>
        <span class="token comment">//String s1 = new String(bys, 0, len);</span>
        <span class="token comment">//System.out.println(&quot;接收的数据为&quot;+s1);</span>

        <span class="token comment">//通过字符流读数据</span>

        <span class="token class-name">BufferedReader</span> br <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BufferedReader</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">InputStreamReader</span><span class="token punctuation">(</span>is<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token class-name">String</span> str<span class="token punctuation">;</span>

        <span class="token comment">//数据写入文件</span>
        <span class="token class-name">BufferedWriter</span> bw <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BufferedWriter</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">FileWriter</span><span class="token punctuation">(</span><span class="token string">&quot;code\\14.txt&quot;</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">while</span><span class="token punctuation">(</span><span class="token punctuation">(</span>str<span class="token operator">=</span>br<span class="token punctuation">.</span><span class="token function">readLine</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token operator">!=</span><span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token comment">//System.out.println(str);</span>
            bw<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span>str<span class="token punctuation">)</span><span class="token punctuation">;</span>
            bw<span class="token punctuation">.</span><span class="token function">newLine</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            bw<span class="token punctuation">.</span><span class="token function">flush</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>


        <span class="token comment">//写反馈给客户端</span>

        <span class="token class-name">OutputStream</span> os <span class="token operator">=</span> s<span class="token punctuation">.</span><span class="token function">getOutputStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        os<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">&quot;数据已经接收&quot;</span><span class="token punctuation">.</span><span class="token function">getBytes</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>


        s<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        ss<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br></div></div><ul><li>效果图</li></ul> <p><img src="https://img-blog.csdnimg.cn/108b2d703ad44bf6a9ae7e4b2eef51d3.gif#pic_center" alt="在这里插入图片描述"></p> <h3 id="_3-7-为每个客户端都开启一个线程"><a href="#_3-7-为每个客户端都开启一个线程" class="header-anchor">#</a> 3.7 为每个客户端都开启一个线程</h3> <ul><li>客户端</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">package</span> 网络编程<span class="token punctuation">.</span>tcp通信<span class="token punctuation">;</span>

<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span><span class="token operator">*</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>net<span class="token punctuation">.</span></span><span class="token class-name">Socket</span></span><span class="token punctuation">;</span>

<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">ClientDemo</span> <span class="token punctuation">{</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">IOException</span> <span class="token punctuation">{</span>
<span class="token comment">//        1.创建客户端的tcp通信</span>
        <span class="token class-name">Socket</span> s <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Socket</span><span class="token punctuation">(</span><span class="token string">&quot;10.152.242.223&quot;</span><span class="token punctuation">,</span> <span class="token number">12345</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">//        2.获取输出流</span>

        <span class="token class-name">OutputStream</span> os <span class="token operator">=</span> s<span class="token punctuation">.</span><span class="token function">getOutputStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">//        3.写数据</span>

        <span class="token comment">//数据来源键盘输入</span>
        <span class="token comment">//BufferedReader br = new BufferedReader(new InputStreamReader(System.in));</span>
        <span class="token class-name">BufferedWriter</span> bw <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BufferedWriter</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">OutputStreamWriter</span><span class="token punctuation">(</span>os<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">//os.write(&quot;hello.world&quot;.getBytes());</span>

        <span class="token comment">//数据来源于文件</span>
        <span class="token class-name">BufferedReader</span> br <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BufferedReader</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">FileReader</span><span class="token punctuation">(</span><span class="token string">&quot;code\\13.txt&quot;</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>



        <span class="token class-name">String</span> str<span class="token punctuation">;</span>
        <span class="token keyword">while</span><span class="token punctuation">(</span><span class="token punctuation">(</span>str<span class="token operator">=</span>br<span class="token punctuation">.</span><span class="token function">readLine</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token operator">!=</span><span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token comment">//如果键盘输入886，停止发送</span>
            <span class="token comment">//if(str.equals(&quot;886&quot;)){</span>
            <span class="token comment">//    break;</span>
            <span class="token comment">//}else{</span>
                bw<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span>str<span class="token punctuation">)</span><span class="token punctuation">;</span>
                bw<span class="token punctuation">.</span><span class="token function">newLine</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                bw<span class="token punctuation">.</span><span class="token function">flush</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token comment">//}</span>
        <span class="token punctuation">}</span>

        <span class="token comment">//告知服务端传输完毕</span>
        s<span class="token punctuation">.</span><span class="token function">shutdownOutput</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>


    <span class="token comment">//    客户端接收服务端的反馈</span>

        <span class="token class-name">InputStream</span> is <span class="token operator">=</span> s<span class="token punctuation">.</span><span class="token function">getInputStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">byte</span><span class="token punctuation">[</span><span class="token punctuation">]</span> bys <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token keyword">byte</span><span class="token punctuation">[</span><span class="token number">1024</span><span class="token punctuation">]</span><span class="token punctuation">;</span>

        <span class="token keyword">int</span> len<span class="token punctuation">;</span>
        len<span class="token operator">=</span>is<span class="token punctuation">.</span><span class="token function">read</span><span class="token punctuation">(</span>bys<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">&quot;服务器的反馈:&quot;</span><span class="token operator">+</span><span class="token keyword">new</span> <span class="token class-name">String</span><span class="token punctuation">(</span>bys<span class="token punctuation">,</span><span class="token number">0</span><span class="token punctuation">,</span>len<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        s<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br></div></div><ul><li>服务线程类</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">package</span> 网络编程<span class="token punctuation">.</span>tcp通信<span class="token punctuation">;</span>

<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span><span class="token operator">*</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>net<span class="token punctuation">.</span></span><span class="token class-name">Socket</span></span><span class="token punctuation">;</span>

<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">ServerThread</span> <span class="token keyword">implements</span> <span class="token class-name">Runnable</span><span class="token punctuation">{</span>

    <span class="token keyword">private</span> <span class="token class-name">Socket</span> s<span class="token punctuation">;</span>

    <span class="token keyword">public</span> <span class="token class-name">ServerThread</span><span class="token punctuation">(</span><span class="token class-name">Socket</span> s<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>s <span class="token operator">=</span> s<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

    <span class="token annotation punctuation">@Override</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">run</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>

    <span class="token comment">//    创建一个字符输入流</span>
        <span class="token class-name">BufferedReader</span> br <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
        <span class="token keyword">try</span> <span class="token punctuation">{</span>
            br <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BufferedReader</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">InputStreamReader</span><span class="token punctuation">(</span>s<span class="token punctuation">.</span><span class="token function">getInputStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">IOException</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
            e<span class="token punctuation">.</span><span class="token function">printStackTrace</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>

        <span class="token keyword">int</span> count<span class="token operator">=</span><span class="token number">20</span><span class="token punctuation">;</span>
        <span class="token comment">//输入的文件位置</span>
        <span class="token class-name">File</span> file <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">File</span><span class="token punctuation">(</span><span class="token string">&quot;code\\12&quot;</span> <span class="token operator">+</span> count <span class="token operator">+</span> <span class="token string">&quot;.txt&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">//防止文件重名，如果存在，则使文件名+1</span>
        <span class="token keyword">while</span><span class="token punctuation">(</span>file<span class="token punctuation">.</span><span class="token function">exists</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            count<span class="token operator">++</span><span class="token punctuation">;</span>
            file <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">File</span><span class="token punctuation">(</span><span class="token string">&quot;code\\12&quot;</span> <span class="token operator">+</span> count <span class="token operator">+</span> <span class="token string">&quot;.txt&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>

        <span class="token comment">//写入文件字符流</span>
        <span class="token class-name">BufferedWriter</span> bw <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
        <span class="token keyword">try</span> <span class="token punctuation">{</span>
            bw <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BufferedWriter</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">FileWriter</span><span class="token punctuation">(</span>file<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">IOException</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
            e<span class="token punctuation">.</span><span class="token function">printStackTrace</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>

        <span class="token class-name">String</span> str<span class="token punctuation">;</span>
        <span class="token keyword">try</span><span class="token punctuation">{</span>
            <span class="token keyword">while</span><span class="token punctuation">(</span><span class="token punctuation">(</span>str<span class="token operator">=</span>br<span class="token punctuation">.</span><span class="token function">readLine</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token operator">!=</span><span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
                bw<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span>str<span class="token punctuation">)</span><span class="token punctuation">;</span>
                bw<span class="token punctuation">.</span><span class="token function">newLine</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                bw<span class="token punctuation">.</span><span class="token function">flush</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>

            <span class="token class-name">OutputStream</span> os <span class="token operator">=</span> s<span class="token punctuation">.</span><span class="token function">getOutputStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            os<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">&quot;数据已经接收&quot;</span><span class="token punctuation">.</span><span class="token function">getBytes</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            s<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">IOException</span> e<span class="token punctuation">)</span><span class="token punctuation">{</span>
            e<span class="token punctuation">.</span><span class="token function">printStackTrace</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>





    <span class="token punctuation">}</span>




<span class="token punctuation">}</span>

</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br><span class="line-number">56</span><br><span class="line-number">57</span><br><span class="line-number">58</span><br><span class="line-number">59</span><br><span class="line-number">60</span><br><span class="line-number">61</span><br><span class="line-number">62</span><br><span class="line-number">63</span><br><span class="line-number">64</span><br><span class="line-number">65</span><br><span class="line-number">66</span><br><span class="line-number">67</span><br></div></div><ul><li>服务端</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">package</span> 网络编程<span class="token punctuation">.</span>tcp通信<span class="token punctuation">;</span>

<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span><span class="token class-name">IOException</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>net<span class="token punctuation">.</span></span><span class="token class-name">ServerSocket</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>net<span class="token punctuation">.</span></span><span class="token class-name">Socket</span></span><span class="token punctuation">;</span>

<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">ServerDemo2</span> <span class="token punctuation">{</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">IOException</span> <span class="token punctuation">{</span>
        <span class="token class-name">ServerSocket</span> ss <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ServerSocket</span><span class="token punctuation">(</span><span class="token number">12345</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

        <span class="token keyword">while</span><span class="token punctuation">(</span><span class="token boolean">true</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
        <span class="token comment">//    监听是否有多个客户端，返回多个Socket对象</span>

            <span class="token class-name">Socket</span> s <span class="token operator">=</span> ss<span class="token punctuation">.</span><span class="token function">accept</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

        <span class="token comment">//    每个对象新建一个线程</span>

            <span class="token keyword">new</span> <span class="token class-name">Thread</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">ServerThread</span><span class="token punctuation">(</span>s<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">start</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br></div></div><ul><li>效果图</li></ul> <p><img src="https://img-blog.csdnimg.cn/9a16374e329a4fb38230e6bc843aef24.gif#pic_center" alt="在这里插入图片描述"></p></div></div>  <div class="page-edit"><div class="edit-link"><a href="https://github.com/linxin1123/vuepress-blog/edit/master/docs/02.后端/41.Java笔记/06.java-网络编程.md" target="_blank" rel="noopener noreferrer">编辑</a> <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></div> <!----> <div class="last-updated"><span class="prefix">上次更新:</span> <span class="time">2023/02/17, 11:29:32</span></div></div> <div class="page-nav-wapper"><div class="page-nav-centre-wrap"><a href="/pages/2d0d17/" class="page-nav-centre page-nav-centre-prev"><div class="tooltip">Java io流（三）</div></a> <a href="/pages/d7d5c4/" class="page-nav-centre page-nav-centre-next"><div class="tooltip">Java 反射和注解</div></a></div> <div class="page-nav"><p class="inner"><span class="prev">
        ←
        <a href="/pages/2d0d17/" class="prev">Java io流（三）</a></span> <span class="next"><a href="/pages/d7d5c4/">Java 反射和注解</a>→
      </span></p></div></div></div> <div class="article-list"><div class="article-title"><a href="/archives/" class="iconfont icon-bi">最近更新</a></div> <div class="article-wrapper"><dl><dd>01</dd> <dt><a href="/pages/0b785d/"><div>
            Vuex
            <!----></div></a> <span class="date">03-14</span></dt></dl><dl><dd>02</dd> <dt><a href="/pages/c59cc0/"><div>
            Vue响应式原理
            <!----></div></a> <span class="date">03-14</span></dt></dl><dl><dd>03</dd> <dt><a href="/pages/83cc7a/"><div>
            Vue虚拟DOM-cnblog
            <!----></div></a> <span class="date">03-14</span></dt></dl> <dl><dd></dd> <dt><a href="/archives/" class="more">更多文章&gt;</a></dt></dl></div></div></main></div> <div class="footer"><div class="icons"><a href="3010733382@qq.com" title="发邮件" target="_blank" class="iconfont icon-youjian"></a><a href="https://github.com/linxin1123" title="GitHub" target="_blank" class="iconfont icon-github"></a><a href="https://music.163.com/#/playlist?id=755597173" title="听音乐" target="_blank" class="iconfont icon-erji"></a></div> 
  Theme by
  <a href="https://github.com/xugaoyi/vuepress-theme-vdoing" target="_blank" title="本站主题">Vdoing</a> 
    | Copyright © 2022-2023
    <span>lingxin | <a href="https://github.com/linxin1123/vuepress-blog/blob/master/LICENSE" target="_blank">MIT License</a></span></div> <div class="buttons"><div title="返回顶部" class="button blur go-to-top iconfont icon-fanhuidingbu" style="display:none;"></div> <div title="去评论" class="button blur go-to-comment iconfont icon-pinglun" style="display:none;"></div> <div title="主题模式" class="button blur theme-mode-but iconfont icon-zhuti"><ul class="select-box" style="display:none;"><li class="iconfont icon-zidong">
          跟随系统
        </li><li class="iconfont icon-rijianmoshi">
          浅色模式
        </li><li class="iconfont icon-yejianmoshi">
          深色模式
        </li><li class="iconfont icon-yuedu">
          阅读模式
        </li></ul></div></div> <!----> <!----> <!----></div><div class="global-ui"><div></div></div></div>
    <script src="/assets/js/app.57550e13.js" defer></script><script src="/assets/js/2.f014c35f.js" defer></script><script src="/assets/js/88.81ef718d.js" defer></script>
  </body>
</html>
